Make posts in protected category invisible

Hi there!

Hope you're fine!

I was wondering if there is any way to make the posts of a protected category totally invisible - no matter how they are listed?

As it is now, it seems to me that the title and everything before the <more> tag is visible.

I suppose this is intended as the Membership plugin is directed towards selling access and thus give visitors teasers, but I am looking for a way to hide certain posts (in a specific category) totally invisible for the general, public audience.

I have been fiddeling around with a combination og permalink structure /url base and URL groups without really getting the result I want.

Any suggestions?